Driving-belt.



A. H. & G. GRIFFIN.

DRIVING BELT.

APPLICATION man IAN. 2. 19|?.

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Patented June 12, 191?.

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AQUILA H. GRIFFIN AND GEORGE GRIFFIN, OF PATERSON, NEW JERSEY, A-SSIGNORS OF ONE-TENTH TO JOHN W. STEWART), OF PATERSON, NEW JERSEY.

DRIVING-BELT.

Application filed January 2, 1917.

l'o all whom t 'may concern.'

Be it known that we, AQUILA H. GRIFFIN and GEORGE GRIFFIN, subjects of the King of England, residing at Paterson, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Driving-Belts, of which the following is a specification.

This invention relates to driving belts of the kind set forth in our applications for Letters Patent of the United States filed August 11th, 1916, and September 25th, 1916, Serial Numbers 114,418 and 121,928, respectively, and it consists in certain improvements involving particularly the means for sheathing the elastic means of such belts and restricting the over-distention thereof, the same being designed with a view to simplify the construction, reduce the cost of manufacture and increase the efiiciency and durability of the belt.

In the accompanying drawing,

Figure 1 is a perspective view of the belt;

Fig. 2 is a fragmentary plan, a certain part appearing broken away;

Fig. 3 shows the gap-including portion of the belt partly in section and partly in elevation;

Fig. 4 is a transverse sectional view and Fig. 5 a fragmentary longitudinal sectional view of the part of the belt at the gap;

Fig. 6 shows one of the springs;

Figs. 7 and 8 are elevations of one of the thongs in the shapes, respectively, before and after assembling with the spring; and, Fig. 9 shows the helical strip laid out The belt includes a section a of relatively non-elastic strip material, such as leather, fabric or the like, capable of assuming good tractive contact with the pulleys. belt there is shown a gap b but it is not indispensable that there be only one gap. Connecting the ends of the material at the gap is elastic means, preferably taking the form, as herein shown, of a helical spring c, having its ends Z formed as loops or eyes lying in a common plane laterally offset with respect to the axis of the spring. The spring is arranged with its body portion mainly in the gap, z'. e., between the ends of the material a, and its loops or eyes CZ are at the outer face e (Fig. 3) of the belt. The ends of the spring are secured to the ends of Specification of Letters Patent.

In the Patented J une 12, 1917.

serial No. 140,044.

the material at the gap by the rivets f; they are preferably clenched immovable with respect to the material a so as to prevent the wear that would be incident to articulation at these points.`

g is a strip composed, preferably, of some strong flexible material, such as leather, and provided with holes at` its ends as shown in Fig. 9. It is wrapped helically and more or less tightly around the spring 0, its ends being secured by the rivets f which penetrate the above-named holes in the ends of the strip. This strip serves to protect the spring from wear incident to its possible contact with the pulleys, sheathing the spring from the pulleys at the inside of the spring; it further serves, in a measure, to limit the distention of the spring in applying the belt to the pulleys.

` Such distention may be further insured against by the flexible thong It, composed say of raw hide. In the present instance, this thong is shown threaded through the spring, its intermediate portion 7L', 1'.. e., where it is embraced bythe spring, being rolled or folded (Figs. 4, 5 and 8) lengthwise and its ends la, being left flat. In the preferred form, each end hf is penetrated by a rivet f and lies between the loop of the spring on the ond hand and the material a of the belt on the other, while the end of the strip g lies between said loop and the head of the rivet. Thus in clenching the rivet the loop of the spring is protected from injury by soft material on both sides of it. The thong, it will be understood, is somewhat longer than the spring when the belt is contracted, so that it then assumes a HeXed or sinuous form (Fig. 3). On distending the belt the thong affords a positive limit to the distention, thus preventing straining the spring.

It is preferred that there be in the gap b a plurality of the elastic means and strips g and also thongs h or their equivalent, when employed, as shown in Figs. 1 and 2.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent is 1. A driving belt formed for the major portion of its circumference of relatively inelastic material having a gap therein and including elastic means in the gap connecting the adjoining ends of said material and also including means, Wrapped' helically around the elastic means, to sheath the latter.

2. A driving belt formed for the major portion of its circumference of relatively in-V elastic material having a gap therein and including elastic means in the gap connecting the adjoining ends of said material and also including means, Wrapped helically around` the elastic means and also connecting said ends, to sheath the latter.

3,. A driving belt .formed for the major porti-on of its circumference' of relatively inelastic material lia-ving a gap therein and including elastic means in the gap connecting the adjoining ends of said material and also including means, Wrapped helically around the elastic means and also connecting said ends, to limit the distention of said means.

4L. A d-riving belt formed for the major portion of its circumference of relatively inelastic material having al gap therein and including elastic means spanning said gapV and a helical member ivrapped around said means and also spanning saidgap, and a common means to secu-re the elastic means and said member to Vsaid material at each side 'of said gap. Y

5. A driving belt formed for the major portion of its circumference of relatively inelastic material having a gap therein, a metallic spring in the gap, gap spanning members of softer material than the spring, each end `of the spring'being interposed" between said members, and means, penetrating said members and each end v0f the spring, to clamp them to said material at each side of the gap therein. V

In testimony whereof We aiiix our signatures.

AQUILAV H. GrRIFFlN..y GEORGE GRIFFIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner vof Patents,

Washington, D. C. I 

